NEW YORK--(BUSINESS WIRE)--Fitch Ratings affirms all ratings of the outstanding student loan notes issued by SLM Private Credit Student Loan Trust 2005-B (SLM 2005-B). The Outlook is revised to Stable from Negative for all notes. A detailed list of rating actions follows at the end of this press release. KEY RATING DRIVERS Adequate Collateral Quality: The trust is collateralized by approximately $775 million of private student loans originated by Navient Corp. under the Signature Education Loan